Well, this was just in an email. Tempest is selling Purple Air products.
“Coming later this year, PurpleAir’s air quality data will be integrated into the Tempest Weather app, offering users a comprehensive solution for tracking weather conditions and air quality in real-time. This data will include PM2.5 (particulate matter concentrations) and AQI (Air Quality Index) from PurpleAir’s network of air quality monitors. This integration will combine the power of Tempest weather insights with PurpleAir’s air quality data for a complete picture of your outdoor environment before you even open the front door!”